Share-Based Payments (Options and Stock Appreciation Rights Outstanding) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available For Grant, Beginning Balance	291,000
Shares Available For Grant, Exercised	0
Shares Available For Grant, Forfeited	0
Shares Available For Grant, Expired	0
Shares Available For Grant, Granted	0
Shares Available For Grant, Ending Balance	291,000
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance	86,118
Options Outstanding, Shares, Exercised	0
Options Outstanding, Shares, Forfeited	(1,450)
Options Outstanding, Shares, Expired	0
Options Outstanding, Shares, Granted	0
Options Outstanding, Shares, Ending Balance	84,668
Weighted-Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 187.83
Options Outstanding, Weighted-Average Exercise Price, Exercised	$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Forfeited	$ 222.50
Options Outstanding, Weighted-Average Exercise Price, Expired	$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Granted	$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 187.23
Compensation cost, liability balance	$ 2,200,000	$ 3,100,000
Total intrinsic value of options exercised	17,000	557,000
Total share-based liabilities paid	17,000	179,000
Total fair value of shares vested	400,000	700,000
Cash received from exercise of options	$ 0	$ 167,000
Stock Appreciation Rights [Member]
Shares/Awards [Roll Forward]
Options Outstanding, Shares, Beginning Balance	75,411
Options Outstanding, Shares, Exercised	(500)
Options Outstanding, Shares, Forfeited	(2,250)
Options Outstanding, Shares, Granted	0
Options Outstanding, Shares, Ending Balance	72,661
Weighted-Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 126.64
Options Outstanding, Weighted-Average Exercise Price, Exercised	$ 114.64
Options Outstanding, Weighted-Average Exercise Price, Forfeited	$ 149.57
Options Outstanding, Weighted-Average Exercise Price, Granted	$ 0.00
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 126.01